JP6006874B2 - Pouch-type secondary battery with safety vent - Google Patents

Pouch-type secondary battery with safety vent Download PDF

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JP6006874B2
JP6006874B2 JP2015524209A JP2015524209A JP6006874B2 JP 6006874 B2 JP6006874 B2 JP 6006874B2 JP 2015524209 A JP2015524209 A JP 2015524209A JP 2015524209 A JP2015524209 A JP 2015524209A JP 6006874 B2 JP6006874 B2 JP 6006874B2
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seal portion
pouch
secondary battery
type secondary
seal
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JP2015526858A (en
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スンヒョン チョン
スンヒョン チョン
ソンキュ キム
ソンキュ キム
チャファン ファン
チャファン ファン
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エルジー・ケム・リミテッド
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
    • H01M10/647—Prismatic or flat cells, e.g. pouch cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/183—Sealing members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/308—Detachable arrangements, e.g. detachable vent plugs or plug systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/317—Re-sealable arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/35—Gas exhaust passages comprising elongated, tortuous or labyrinth-shaped exhaust passages
    • H01M50/367—Internal gas exhaust passages forming part of the battery cover or case; Double cover vent systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H01M50/557—Plate-shaped terminals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Description

本発明は、安全ベントを有するパウチ型二次電池に関し、より詳細には、予め定められた方向にのみガスを排出する安全ベントを有するパウチ型二次電池に関する。   The present invention relates to a pouch-type secondary battery having a safety vent, and more particularly to a pouch-type secondary battery having a safety vent that discharges gas only in a predetermined direction.

一般に、モバイル機器に対する技術開発と需要の増加で二次電池の需要もまた急激に増加しており、その中でもエネルギー密度と作動電圧が高く、保存と寿命特性に優れたリチウム(イオン/ポリマー)二次電池は、各種モバイル機器はもちろん、多様な電子製品のエネルギー源として広く用いられている。   In general, the demand for secondary batteries is also increasing rapidly due to technological development and increasing demand for mobile devices. Among them, lithium (ion / polymer) secondary batteries with high energy density and operating voltage, and excellent storage and life characteristics. Secondary batteries are widely used as energy sources for various mobile devices as well as various electronic products.

韓国公開特許第2009-0065587号は、安全性が向上されたパウチ型二次電池を開示しており、該パウチ型二次電池は、セルの内部と電極タブのシール部にチャンネルが形成されている。過充電または内部短絡などの原因により、パウチ内部にガスが過度に発生して圧力が高くなると、前記チャンネルを介してガスがパウチの外部に排出され得る。すなわち、セル内部のガスが外部に排出されるときには、常に電極タブのシール部を介して排出されるので、ガスの排出方向を予め予測することができる。   Korean Patent No. 2009-0065587 discloses a pouch-type secondary battery with improved safety, and the pouch-type secondary battery has a channel formed in the inside of the cell and the seal portion of the electrode tab. Yes. If gas is excessively generated inside the pouch due to overcharge or internal short circuit and the pressure is increased, the gas can be discharged to the outside of the pouch through the channel. That is, when the gas inside the cell is discharged to the outside, it is always discharged through the seal portion of the electrode tab, so that the gas discharge direction can be predicted in advance.

もちろん、特定の電子装置、機械装置の場合、ガスがパウチ型二次電池の電極タブの近傍を介して排出されても構わない。   Of course, in the case of a specific electronic device or mechanical device, the gas may be discharged through the vicinity of the electrode tab of the pouch-type secondary battery.

一方、他の電子装置、機械装置の場合には、熱またはガスに敏感な装置がパウチ型二次電池の電極タブの近傍に位置することがある。したがって、この場合、熱やガスに敏感な装置の破損腐食などを防止するために、ガスがパウチ型二次電池の電極タブの近傍ではなく他の場所を介して排出されることが好ましい。   On the other hand, in the case of other electronic devices and mechanical devices, a device sensitive to heat or gas may be located in the vicinity of the electrode tab of the pouch-type secondary battery. Therefore, in this case, in order to prevent damage and corrosion of the device sensitive to heat and gas, it is preferable that the gas is discharged not through the vicinity of the electrode tab of the pouch-type secondary battery but through another place.

しかし、前記公開特許に開示されたパウチ型二次電池を、後者の機械または電子装置に取り付けるためには、熱またはガスに敏感な装置が電極タブの近傍に位置しないように機械または電子装置を設計変更しなければならない問題がある。さらに、もし設計変更が不可能な機械または電子装置には、このようなパウチ型二次電池を取り付けることができないとの問題がある。   However, in order to attach the pouch-type secondary battery disclosed in the above-mentioned published patent to the latter machine or electronic device, the machine or electronic device should be installed so that a device sensitive to heat or gas is not located near the electrode tab. There is a problem that needs to be changed. Furthermore, there is a problem that such a pouch-type secondary battery cannot be attached to a mechanical or electronic device that cannot be changed in design.

本発明は、前述した問題点を解決するために着想されたものであって、所望の如何なる方向にも安全ベントを形成することが可能な、安全ベントを有するパウチ型二次電池を提供することを目的とする。 The present invention has been conceived to solve the above-described problems, and provides a pouch-type secondary battery having a safety vent capable of forming a safety vent in any desired direction. With the goal.

前記のような目的を達成するために、本発明の好ましい実施例に係るパウチ型二次電池は：電極組立体;及び前記電極組立体を収容し、縁部に形成されたシール部を有するパウチ型ケース;を備え、前記シール部は：閉曲線をなして前記電極組立体を外部と遮断する内部シール部;及び前記内部シール部との間にガス流路を形成しながら、前記内部シール部の外郭を取り囲んで安全ベントを有する外部シール部;を含む。   In order to achieve the above object, a pouch-type secondary battery according to a preferred embodiment of the present invention includes: an electrode assembly; and a pouch that houses the electrode assembly and has a seal portion formed at an edge. A mold case; and the seal portion: an internal seal portion that forms a closed curve and shields the electrode assembly from the outside; and a gas flow path is formed between the internal seal portion and the internal seal portion. An outer seal portion surrounding the outer shell and having a safety vent;

好ましくは、前記外部シール部のシール面の幅は、前記内部シール部のシール面の幅よりも広い。   Preferably, the width of the seal surface of the outer seal portion is wider than the width of the seal surface of the inner seal portion.

好ましくは、前記シール部は、前記内部シール部及び前記外部シール部と全て離隔されたまま前記ガス流路に沿って配置される中間シール部をさらに備える。   Preferably, the seal part further includes an intermediate seal part disposed along the gas flow path while being separated from the inner seal part and the outer seal part.

好ましくは、前記外部シール部のシール面の幅は、前記中間シール部のシール面の幅よりも広く、前記中間シール部のシール面の幅は、前記内部シール部のシール面の幅よりも広い。   Preferably, the width of the seal surface of the outer seal portion is wider than the width of the seal surface of the intermediate seal portion, and the width of the seal surface of the intermediate seal portion is wider than the width of the seal surface of the inner seal portion. .

好ましくは、前記中間シール部は閉曲線をなす。   Preferably, the intermediate seal portion has a closed curve.

好ましくは、前記中間シール部は、前記内部シール部と前記外部シール部との間のガス流動を許容する中間ベントを有する。   Preferably, the intermediate seal portion has an intermediate vent that allows gas flow between the inner seal portion and the outer seal portion.

好ましくは、前記中間ベントは、前記安全ベントの反対側に位置する。   Preferably, the intermediate vent is located on the opposite side of the safety vent.

好ましくは、前記安全ベントは、群集された複数個のベントからなる。   Preferably, the safety vent comprises a plurality of vents assembled together.

本発明によれば、所望の如何なる方向にも安全ベントを形成することが可能な、安全ベントを有するパウチ型二次電池を提供することができる。   According to the present invention, it is possible to provide a pouch-type secondary battery having a safety vent that can form a safety vent in any desired direction.

本明細書に添付される次の図等は、本発明の好ましい実施例を例示するものであり、前述した発明の詳細な説明とともに本発明の技術思想をさらに理解させる役割を担うものなので、本発明はそのような図に記載された事項にのみ限定して解釈されてはならない。 The following drawings attached to the present specification exemplify a preferred embodiment of the present invention, and serve to further understand the technical idea of the present invention together with the detailed description of the invention described above. The invention should not be construed as limited to the matter set forth in such figures.

本発明の第1実施例に係るパウチ型二次電池の分解斜視図である。1 is an exploded perspective view of a pouch-type secondary battery according to a first embodiment of the present invention. 図1のパウチ型二次電池のシール部を基準とした簡略横断面図である。FIG. 2 is a simplified cross-sectional view based on a seal portion of the pouch-type secondary battery in FIG. 本発明の第2実施例に係るパウチ型二次電池のシール部を基準とした簡略横断面図である。FIG. 6 is a simplified cross-sectional view based on a seal portion of a pouch-type secondary battery according to a second embodiment of the present invention. 本発明の第3実施例に係るパウチ型二次電池のシール部を基準とした簡略横断面図である。FIG. 6 is a simplified cross-sectional view based on a seal portion of a pouch-type secondary battery according to a third embodiment of the present invention. 本発明の第4実施例に係るパウチ型二次電池のシール部を基準とした簡略横断面図である。FIG. 6 is a simplified cross-sectional view based on a seal portion of a pouch-type secondary battery according to a fourth embodiment of the present invention.

以下、図を参照して、本発明の好ましい実施例に係るパウチ型二次電池に対して詳細に説明する。   Hereinafter, a pouch-type secondary battery according to a preferred embodiment of the present invention will be described in detail with reference to the drawings.

本明細書及び請求の範囲に用いられた用語や単語は通常的かつ辞典的な意味に限定して解釈されてはならず、発明者は自分の発明を最善の方法で説明するために用語の概念を適宜定義することができるとの原則に立脚して、本発明の技術的思想に符合する意味と概念として解釈されるべきである。したがって、本明細書に記載された実施例と図に示された構成は、本発明の最も好ましい一実施例に過ぎず、本発明の技術的思想を全て代弁するものではないため、本出願時点においてこれらを代替できる多様な均等物と変形例があり得ることを理解しなければならない。   Terms and words used in the specification and claims should not be construed to be limited to the ordinary and lexical meaning, and the inventor should use the terminology to explain his invention in the best possible manner. Based on the principle that the concept can be defined as appropriate, it should be interpreted as a meaning and concept consistent with the technical idea of the present invention. Accordingly, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. It should be understood that there are various equivalents and variations that can be substituted in

図での各構成要素またはその構成要素をなす特定部分の大きさは、説明の便宜及び明確性のため誇張されたり省略されたり、または概略的に示された。したがって、各構成要素の大きさは実際の大きさを全く反映しているわけではない。関連の公知機能あるいは構成に対する具体的な説明が、本発明の要旨を不要に曖昧にする可能性があると判断される場合、そのような説明は省略する。   In the drawings, the size of each component or a specific portion constituting the component is exaggerated, omitted, or schematically illustrated for convenience and clarity of description. Therefore, the size of each component does not reflect the actual size at all. If it is determined that a specific description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, such description will be omitted.

＜第1実施例＞
図1は、本発明の第1実施例に係るパウチ型二次電池の分解斜視図である。図2は、図1のパウチ型二次電池のシール部を基準とした簡略横断面図である。図2では、電極リード20及び電極タブの図示を省略した。 <First embodiment>
FIG. 1 is an exploded perspective view of a pouch-type secondary battery according to a first embodiment of the present invention. FIG. 2 is a simplified cross-sectional view based on the seal portion of the pouch-type secondary battery of FIG. In FIG. 2, the electrode lead 20 and the electrode tab are not shown.

図1及び図2に示す通り、本発明の第1実施例に係るパウチ型二次電池100は、電極組立体10と、前記電極組立体10を収容するパウチ型ケース30とを備える。   As shown in FIGS. 1 and 2, the pouch-type secondary battery 100 according to the first embodiment of the present invention includes an electrode assembly 10 and a pouch-type case 30 that houses the electrode assembly 10.

電極組立体10は、第1電極板11、第2電極板12、セパレータ13を有し、前記第1電極板11と第2電極板12のそれぞれから延長された電極タブに電極リード20が連結される。   The electrode assembly 10 includes a first electrode plate 11, a second electrode plate 12, and a separator 13. An electrode lead 20 is connected to an electrode tab extended from each of the first electrode plate 11 and the second electrode plate 12. Is done.

パウチ型ケース30は、上部ケース32と下部ケース31を含み、パウチ型ケース30に形成された収納部31aに電極組立体10が収納される。また、前記パウチ型ケース30の縁部には、シール部40が形成される。より詳細には、上部ケース32を下部ケース31に覆って互いに対向するようにした状態でパウチ型ケース30の縁部をシールすると、パウチ型ケース30の縁部にシール部40が形成される。   The pouch-type case 30 includes an upper case 32 and a lower case 31, and the electrode assembly 10 is stored in a storage portion 31a formed in the pouch-type case 30. A seal portion 40 is formed at the edge of the pouch-type case 30. More specifically, when the edge of the pouch-type case 30 is sealed with the upper case 32 covered with the lower case 31 so as to face each other, the seal portion 40 is formed at the edge of the pouch-type case 30.

前記シール部40は、内部シール部42と、外部シール部48とを含む。   The seal part 40 includes an internal seal part 42 and an external seal part 48.

内部シール部42は閉曲線をなしており、前記電極組立体10を外部と遮断する役割を担う。 The inner seal portion 42 has a closed curve, and plays a role of blocking the electrode assembly 10 from the outside.

外部シール部48は、内部シール部42と離隔されたまま内部シール部42の外郭を取り囲んでおり、内部シール部42と外部シール部48との間にはガス流路46が形成される。外部シール部48は、ガスを外部に排出するための安全ベント49を有し、よって、内部シール部42とは異なって開曲線をなしている。 The outer seal portion 48 surrounds the outline of the inner seal portion 42 while being separated from the inner seal portion 42, and a gas flow path 46 is formed between the inner seal portion 42 and the outer seal portion 48. The outer seal portion 48 has a safety vent 49 for discharging gas to the outside, and thus has an open curve unlike the inner seal portion 42.

図2を基準としたとき、電極リード20及び電極タブは、電極組立体10の短辺側に位置するか、電極組立体10の長辺側に位置することができる。また、図1に示されたように、電極リード20及び電極タブは、電極組立体10の一側で並んで引き出されてもよいが、電極組立体10の両側からそれぞれ引き出されてもよいことはもちろんである。このように、電極リード20及び電極タブの引出方向に影響を受けず、如何なる方向に安全ベント49を形成したとしても構わない。 With reference to FIG. 2, the electrode lead 20 and the electrode tab can be located on the short side of the electrode assembly 10 or on the long side of the electrode assembly 10. Further, as shown in FIG. 1, the electrode lead 20 and the electrode tab may be pulled out side by side on one side of the electrode assembly 10, but may be pulled out from both sides of the electrode assembly 10, respectively. Of course. In this way, the safety vent 49 may be formed in any direction without being affected by the drawing direction of the electrode lead 20 and the electrode tab.

内部シール部42と外部シール部48とをシールするため、シールプレスを用いることができる。また、シールプレスでパウチ型ケース30の縁部を加圧してシールすることにより、内部シール部42と外部シール部48がともに形成されてよい。したがって、パウチ型ケース30の内部圧力に対してシール部40が耐えられる圧力の限界は、シール面の幅に比例することとなる。 In order to seal the inner seal portion 42 and the outer seal portion 48, a seal press can be used. Further, both the inner seal portion 42 and the outer seal portion 48 may be formed by pressurizing and sealing the edge portion of the pouch-type case 30 with a seal press. Therefore, the limit of the pressure that the seal portion 40 can withstand with respect to the internal pressure of the pouch-type case 30 is proportional to the width of the seal surface.

過充電または内部短絡などの原因により、パウチ内部にガスが過度に発生して圧力が高くなり、該圧力が基準圧力に至るようになると、内部シール部42が破損される。機械装置、電子装置などに取り付けられるパウチ型二次電池100の取付状態及びパウチ型二次電池100の運用状況などに応じて、内部シール部42はランダム(random)に破損され得る。すなわち、内部シール部42の正確にどの領域が破損されるかは分からない。 If the gas is excessively generated inside the pouch due to overcharge or internal short circuit and the pressure becomes high, and the pressure reaches the reference pressure, the internal seal portion 42 is broken. Depending on the mounting state of the pouch-type secondary battery 100 attached to a mechanical device, an electronic device, etc., the operation status of the pouch-type secondary battery 100, etc., the internal seal portion 42 may be randomly damaged. That is, it is not known which region of the inner seal portion 42 is damaged.

しかし、内部シール部42の如何なる領域が破損したとしても、ガスがガス流路46に沿って流れるようになり、外部シール部48に形成された安全ベント49を介して外部に抜け出すことができるようになる。 However, even if any region of the inner seal portion 42 is damaged, the gas can flow along the gas flow path 46 and can escape to the outside through the safety vent 49 formed in the outer seal portion 48. become.

安全ベント49の位置の決定において、電極リード20または電極タブの近傍にのみ安全ベント49を配置しなければならない必要はない。したがって、もし、パウチ型二次電池100の電極リード20または電極タブの近傍に熱またはガスに敏感な装置が位置する場合であるとしても、このような装置を避けて安全ベント49を幾らでも安全な場所に配置されるようにすることができる。 In determining the position of the safety vent 49, it is not necessary to place the safety vent 49 only in the vicinity of the electrode lead 20 or the electrode tab. Therefore, even if a device sensitive to heat or gas is located in the vicinity of the electrode lead 20 or the electrode tab of the pouch-type secondary battery 100, the safety vent 49 can be safely avoided by avoiding such a device. It can be arranged in any place.

一方、内部シール部42が破損される瞬間を想定しておくようにする。内部シール部42が破損され、ガス流路46に瞬間的にガスによる強い圧力が加えられたとしても、外部シール部48は破損されずに維持されなければならない。 On the other hand, the moment when the internal seal portion 42 is broken is assumed. Even if the inner seal portion 42 is damaged and a strong gas pressure is momentarily applied to the gas flow path 46, the outer seal portion 48 must be maintained without being damaged.

第1実施例に係るパウチ型二次電池100の外部シール部48のシール面の幅(D3)を内部シール部42のシール面の幅(D1)より広く形成するようにすると、内部シール部42が破損される瞬間に外部シール部48もともに破損されることを防止し、安全ベント49のみを介してガスが外部に排出されることを担保することができる。 If the width (D 3 ) of the seal surface of the outer seal portion 48 of the pouch-type secondary battery 100 according to the first embodiment is formed wider than the width (D 1 ) of the seal surface of the inner seal portion 42, the inner seal It is possible to prevent the external seal part 48 from being damaged at the moment when the part 42 is damaged, and to ensure that the gas is discharged to the outside only through the safety vent 49.

＜第2実施例＞
図3は、本発明の第2実施例に係るパウチ型二次電池のシール部を基準とした簡略横断面図である。図3では、電極リード20及び電極タブの図示を省略しており、第1実施例と共通の内容は、重複説明を避けるために大部分省略し、第1実施例と相違する点を中心に説明することを明らかにしておく。 <Second embodiment>
FIG. 3 is a simplified cross-sectional view based on the seal portion of the pouch-type secondary battery according to the second embodiment of the present invention. In FIG. 3, the illustration of the electrode lead 20 and the electrode tab is omitted, and the contents common to the first embodiment are largely omitted in order to avoid duplication, and mainly the points different from the first embodiment. Make clear what you explain.

図3に示す通り、本発明の第2実施例に係るパウチ型二次電池100Aは、第1実施例とシール部40の構成において差がある。 As shown in FIG. 3, the pouch-type secondary battery 100A according to the second embodiment of the present invention is different from the first embodiment in the configuration of the seal portion 40.

すなわち、シール部40は、内部シール部42と外部シール部48以外にも中間シール部44をさらに含む。前記中間シール部44は、内部シール部42及び外部シール部48と全て離隔されたままガス流路46に沿って配置される。これにより、ガス流路46も複数個に区画される。 That is, the seal portion 40 further includes an intermediate seal portion 44 in addition to the inner seal portion 42 and the outer seal portion 48. The intermediate seal portion 44 is disposed along the gas flow path 46 while being all separated from the inner seal portion 42 and the outer seal portion 48. Thereby, the gas flow path 46 is also divided into a plurality of sections.

また、第2実施例に係るパウチ型二次電池100Aの場合、外部シール部48のシール面の幅(D3)は、中間シール部44のシール面の幅(D2)よりも広く形成されてよく、中間シール部44のシール面の幅(D2)は、内部シール部42のシール面の幅(D1)よりも広く形成されてよい。さらに、中間シール部44は閉曲線をなす。 In the case of the pouch-type secondary battery 100A according to the second embodiment, the width (D 3 ) of the seal surface of the outer seal portion 48 is formed wider than the width (D 2 ) of the seal surface of the intermediate seal portion 44. Alternatively, the width (D 2 ) of the seal surface of the intermediate seal portion 44 may be formed wider than the width (D 1 ) of the seal surface of the inner seal portion. Further, the intermediate seal portion 44 forms a closed curve.

したがって、内部シール部42が破損される瞬間に中間シール部44がともに破損されることが防止され、ガスによる圧力がさらに上昇して中間シール部44が破損される瞬間には、外部シール部48がともに破損されることが防止される。 Accordingly, the intermediate seal portion 44 is prevented from being damaged at the moment when the inner seal portion 42 is damaged, and at the moment when the pressure due to the gas is further increased and the intermediate seal portion 44 is damaged, the outer seal portion 48 is prevented. Are prevented from being damaged together.

その上、内部シール部42、中間シール部44が段階的に破損されるため、ガスが外部に排出されるときの圧力が段階的に低減される効果がある。   In addition, since the inner seal part 42 and the intermediate seal part 44 are broken stepwise, there is an effect that the pressure when the gas is discharged to the outside is reduced stepwise.

＜第3実施例＞
図4は、本発明の第3実施例に係るパウチ型二次電池のシール部を基準とした簡略横断面図である。図4では、電極リード20及び電極タブの図示を省略しており、第2実施例と共通の内容は、重複説明を避けるために大部分省略し、第2実施例と相違する点を中心に説明することを明らかにしておく。 <Third embodiment>
FIG. 4 is a simplified cross-sectional view based on the seal portion of the pouch-type secondary battery according to the third embodiment of the present invention. In FIG. 4, the illustration of the electrode lead 20 and the electrode tab is omitted, and the contents common to the second embodiment are largely omitted in order to avoid duplication, and mainly the points different from the second embodiment. Make clear what you explain.

図4に示す通り、本発明の第3実施例に係るパウチ型二次電池100Bは、第2実施例と中間シール部44の構成において差がある。 As shown in FIG. 4, the pouch-type secondary battery 100B according to the third embodiment of the present invention is different from the second embodiment in the configuration of the intermediate seal portion 44.

すなわち、中間シール部44は中間ベント45を有し、前記中間ベント45は、内部シール部42と外部シール部48との間のガス流動を許容する役割を担う。 That is, the intermediate seal portion 44 has an intermediate vent 45, and the intermediate vent 45 plays a role of allowing gas flow between the inner seal portion 42 and the outer seal portion 48.

第3実施例の場合、内部シール部42が破損される瞬間、複数個に区画されたガス流路46のうち内側ガス流路46を通してガスが流れるようになり、中間ベント45を介して再び外側ガス流路46を通してガスが流れ、最終的に安全ベント49を介してガスが外部に排出される。 In the case of the third embodiment, at the moment when the internal seal portion 42 is broken, the gas flows through the inner gas flow path 46 among the gas flow paths 46 divided into a plurality of parts, and is again outside through the intermediate vent 45. The gas flows through the gas flow path 46, and finally the gas is discharged to the outside through the safety vent 49.

第2実施例では、内部シール部42と、中間シール部44の段階的破損によりガスが外部に排出されるときの圧力が段階的に低減されるのに比べ、第3実施例では、ガスが内側ガス流路46と外側ガス流路46を通過する過程中にガスの圧力が低減される効果がある。 In the second embodiment, the pressure when the gas is discharged to the outside due to the gradual breakage of the inner seal portion 42 and the intermediate seal portion 44 is reduced stepwise, in the third embodiment the gas is There is an effect that the pressure of the gas is reduced during the process of passing through the inner gas passage 46 and the outer gas passage 46.

また、図4に示されたように、中間ベント45が安全ベント49の反対側に位置する場合は、ガスが外部に排出されるまでの距離を最大化することができる。ここで、安全ベント49の反対側とは、幾何学的に厳密な意味での反対側だけでなく、図4を基準として、中間シール部44の右側に安全ベント49が形成されている場合を包括的に指す意味で用いられたものであることを明らかにしておく。 Further, as shown in FIG. 4, when the intermediate vent 45 is located on the opposite side of the safety vent 49, the distance until the gas is discharged to the outside can be maximized. Here, the opposite side of the safety vent 49 is not only the opposite side in a geometrically strict sense, but also the case where the safety vent 49 is formed on the right side of the intermediate seal portion 44 with reference to FIG. It should be clarified that the term is used in a comprehensive sense.

＜第4実施例＞
図5は、本発明の第4実施例に係るパウチ型二次電池のシール部を基準とした簡略横断面図である。図5では、電極リード20及び電極タブの図示を省略しており、第1実施例と共通の内容は、重複説明を避けるために大部分省略し、第1実施例と相違する点を中心に説明することを明らかにしておく。 <Fourth embodiment>
FIG. 5 is a simplified cross-sectional view based on the seal portion of the pouch-type secondary battery according to the fourth embodiment of the present invention. In FIG. 5, the illustration of the electrode lead 20 and the electrode tab is omitted, and the contents common to the first embodiment are largely omitted in order to avoid duplicate explanation, and mainly the points different from the first embodiment. Make clear what you explain.

図5に示す通り、本発明の第4実施例に係るパウチ型二次電池100Cは、第1実施例と安全ベント49の形状において差がある。 As shown in FIG. 5, the pouch-type secondary battery 100C according to the fourth embodiment of the present invention is different in the shape of the safety vent 49 from the first embodiment.

すなわち、安全ベントは群集された複数個のベントからなっている。 That is, the safety vent is composed of a plurality of bent vents.

第4実施例の安全ベント49の面積が第1実施例の安全ベント49の面積と同一であると仮定すると、両実施例において、ガスが外部に排出される速度は同一である。しかし、第4実施例の場合、それぞれのベントの大きさが小さいため、ガス流路46の内部に異物が流入する可能性が低いとの長点がある。 Assuming that the area of the safety vent 49 of the fourth embodiment is the same as the area of the safety vent 49 of the first embodiment, in both embodiments, the rate at which the gas is discharged to the outside is the same. However, in the case of the fourth embodiment, since the size of each vent is small, there is an advantage that the possibility that foreign matter flows into the gas flow path 46 is low.

一方、第4実施例の技術的思想は、第1実施例だけでなく、第2実施例、第3実施例にも適用され得るのはもちろんである。 On the other hand, the technical idea of the fourth embodiment can be applied not only to the first embodiment but also to the second and third embodiments.

以上で、本発明は、たとえ限定された実施例と図によって説明されたが、本発明はこれによって限定されず、本発明が属する技術分野で通常の知識を有する者により、本発明の技術思想と特許請求の範囲の均等範囲内で多様な修正及び変形が可能であることはもちろんである。

In the above, the present invention has been described with reference to limited embodiments and drawings. However, the present invention is not limited thereto, and technical ideas of the present invention can be obtained by persons having ordinary knowledge in the technical field to which the present invention belongs. It goes without saying that various modifications and variations can be made within the equivalent scope of the claims.

Claims (7)

電極組立体;及び
前記電極組立体を収容し、縁部に形成されたシール部を有するパウチ型ケース;を備え、
前記シール部は、閉曲線をなして前記電極組立体を外部と遮断する内部シール部;及び前記内部シール部との間にガス流路を形成しながら、前記内部シール部の外郭を取り囲んで安全ベントを有する外部シール部;を含み、
前記シール部は、前記内部シール部及び前記外部シール部と全て離隔されたまま前記ガス流路に沿って配置される中間シール部をさらに備えていることを特徴とするパウチ型二次電池。 An electrode assembly; and
A pouch-type case containing the electrode assembly and having a seal portion formed at an edge;
The seal part forms a closed curve to cut off the electrode assembly from the outside; and a gas vent is formed between the inner seal part and a safety vent surrounding the outer seal of the inner seal part Including an external seal portion;
The pouch-type secondary battery, wherein the seal portion further includes an intermediate seal portion disposed along the gas flow path while being spaced apart from the inner seal portion and the outer seal portion . 前記外部シール部のシール面の幅は、前記内部シール部のシール面の幅よりも広いことを特徴とする請求項1に記載のパウチ型二次電池。   2. The pouch-type secondary battery according to claim 1, wherein the width of the seal surface of the outer seal portion is wider than the width of the seal surface of the inner seal portion. 前記外部シール部のシール面の幅は、前記中間シール部のシール面の幅よりも広く、前記中間シール部のシール面の幅は、前記内部シール部のシール面の幅よりも広いことを特徴とする請求項１に記載のパウチ型二次電池。 The width of the seal surface of the outer seal portion is wider than the width of the seal surface of the intermediate seal portion, and the width of the seal surface of the intermediate seal portion is wider than the width of the seal surface of the inner seal portion. The pouch-type secondary battery according to claim 1 . 前記中間シール部は閉曲線をなすことを特徴とする請求項１に記載のパウチ型二次電池。 The pouch-type secondary battery according to claim 1 , wherein the intermediate seal portion has a closed curve. 前記中間シール部は、前記内部シール部と前記外部シール部との間のガス流動を許容する中間ベントを有することを特徴とする請求項１に記載のパウチ型二次電池。 2. The pouch-type secondary battery according to claim 1 , wherein the intermediate seal portion has an intermediate vent that allows gas flow between the inner seal portion and the outer seal portion. 前記中間ベントは、前記安全ベントの反対側に位置することを特徴とする請求項５に記載のパウチ型二次電池。 The pouch-type secondary battery according to claim 5 , wherein the intermediate vent is located on the opposite side of the safety vent. 前記安全ベントは、群集された複数個のベントからなることを特徴とする請求項１に記載のパウチ型二次電池。 The pouch-type secondary battery according to claim 1 , wherein the safety vent includes a plurality of bent vents.
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